Continuous zooming Hartmann sensor utilizing point light source for calibration

Abstract

The invention relates to a continuous zooming Hartmann sensor by utilizing pointolite calibration. The invention is characterized in that: the Hartmann sensor makes two changes on the basis of the prior Hartmann sensor: firstly, after the beam contraction, a lens is changed into a lens set which can continuously zoom; secondly, a light source system is arranged in the middle of a beam contraction system; through adjusting a foci of the lens after beam contraction, the incident beams in different apertures are output to a microlens array by the same emergent aperture; therefore, the beams in different incident apertures can sample by the same spatial sampling frequency. The continuous zooming Hartmann sensor enlarges the application range of the Hartmann sensor to the field of measuring the continuously-changed beam apertures and has the same spatial sampling frequency for different incident apertures, thereby measuring the beams with different apertures on the premise of not reducing measurement precision and increasing the universality of the Hartmann sensor in order that one Hartmann sensor can be used for different apertures and save use cost.

Description

technical field [0001] The invention relates to a Hartmann sensor, in particular to a Hartmann sensor capable of continuous zooming. Background technique [0002] A Hartmann wavefront sensor is an instrument capable of detecting the shape of a wavefront, and it has been widely used in adaptive optics, optical mirror detection, medical instruments, and celestial object imaging. A traditional Hartmann sensor is usually composed of a beam reduction system, a microlens array, a photodetector, and a wavefront processor, as shown in Figure 2. In the use of the Hartmann sensor, the parameters of the Hartmann sensor are often designed according to the requirements of the application, including the beam shrinkage ratio, the number of sub-apertures, and the size of the sub-aperture. In this case, the Hartmann sensor designed is unique, and is only suitable for a specific light aperture. The change of the external environment will make the technical index of the Hartmann sensor fail t...

AI Technical Summary

Problems solved by technology

In this case, the Hartmann sensor designed is unique and only suitable for a specific light aperture. Changes in the external environment will make the technical indicators of the Hartmann sensor fail to meet the design requirements.

In addition, there are still some occasions where the light aperture is not unique. Since the beam reduction ratio of the Hartmann sensor design has been fixed, this will lead to changes in the beam diameter exiting the microlens array. Without replacing the Hartmann sensor , the spatial resolution of light with different beam apertures on the Hartmann will be different, which will have a greater impact on the measurement accuracy of the Hartmann

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